Join the Sleepover Club: Frankie, Kenny, Felicity, Rosie and Lyndsey, five girls who want to have fun -- but who always end up in mischief. Greetings, earthlings! When Frankie is given a telescope for a late birthday present, the gang get really excited about star-gazing -- and Fliss, of course, goes horoscope mad. But what are those strange green lights they see up on Cuddington Hill one night? Could it possibly be...aliens?!